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Circuit Pack Descriptions
7-74 Issue 3 June 2001
Maintenance Signal Functions 7
The major maintenance signal functions are as follows:
■ Detects STS-1 path AIS coming from the fiber
■ Detects STS-1 path unequipped signal coming from the fiber
■ Inserts DS3 AIS toward the fiber and DSX-3
■ Detects DS3 AIS coming from the fiber
■ Inserts and detects STS-1 path yellow signal to/from the fiber
■ Detects DS3 OOF from the fiber
■ Detects DS3 B3ZS violation threshold crossings from the DSX-3
■ Inserts and detects STS-1 path trace (BBG4B only).
BBG6 STS1E Circuit Pack Description 7
NOTE:
All references to “high-speed” applications of the BBG6 STS1E circuit pack are not
applicable to DDM-2000 OC-3 Release 13.0.
Purpose of Circuit 7
The STS1E circuit pack provides an interface between EC-1 and DS1-rate
(high-speed) or EC-1 and OC-3-rate (low-speed) applications.
STS1E Faceplate Indicators 7
The STS1E circuit pack faceplate indicators are shown in Figure 7-28.
The red FAULT LED is lighted by the SYSCTL on detection of STS1E circuit pack
failure. In the event of an incoming signal failure, this LED flashes on and off. The
green ACTIVE LED lights when the circuit pack is active (carrying service).
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